JPS6215522Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention (technical field of the invention) Hydraulic cylinders and pneumatic cylinders have a head-side cover fixed to one end of a cylinder tube and a rod-side cover fixed to the other end. A piston is housed inside this cylinder tube, and the piston rod protrudes outside from the rod cover. The present invention relates to a fixing structure between a cylinder tube and a cover of such a hydraulic/pneumatic cylinder.

(Prior art and its problems) The conventional fixing structure between the cylinder tube and the cover of a hydraulic/pneumatic cylinder generally includes a tie rod method and a screw-in method, and special methods include a lock ring method and a caulking method.

The tie rod method uses four through bolts to connect the covers at both ends of the cylinder tube, which is not only troublesome to assemble and disassemble, but also increases the size in the radial direction.

The screw-in method has a small radial dimension and a smooth shape, but there is a risk that it may come loose if the left and right port positions are changed.

The lock ring type has a simple structure and is easy to assemble, but the positions of the left and right ports may shift during use. It is also difficult to disassemble.

The caulking method allows for easy initial port positioning and does not shift during use, but cannot be disassembled and internal repairs cannot be performed. Furthermore, once the bolt is crimped, the port position cannot be changed.

As described above, each conventional fixing structure has its advantages and disadvantages, and there has been no small silicone structure that is easy to disassemble and assemble, and that allows the positions of the left and right ports to be easily changed.

(Technical problem of the invention) The technical problem of the invention is to realize a fixing structure that is easy to disassemble and assemble, allows easy change of left and right port positions, and has a small radial dimension. be.

(b) Structure of the invention (technical means of the invention) The technical means of the invention taken to solve this technical problem is that a part or all of the cover is inserted into the end of the cylinder tube. For those that are fixed to each other, a locking member that has an engaging groove with the locking member formed in the circumferential direction on the inner surface of the end of the cylinder tube, and a part of the engaging member can be fitted into the bottom surface of the engaging groove. A plurality of small locking holes are opened at intervals, and an appropriate number of sink holes are formed at positions corresponding to the locking grooves on the outer surface of the cover, and a locking member is built in, and between the side surface of the sink hole and the outside, A set screw having a tapered tip is inserted therethrough, and the locking member in the recessed hole can be inserted into the engagement groove and the locking hole by operating the set screw.

(Operation of technical means) According to this technical means, the locking member that fixes the cylinder tube and the cover is loaded into the hole in the cover so that it can move in and out, and the locking member is inserted into the hole from the outside. In addition, this can be done by simply operating the set screw with a tapered tip, so when assembling the cylinder tube and cover, simply fit the cover onto the cylinder tube and then screw the set screw in the tightening direction. That's fine. When tightened in this manner, a portion of the locking member enters the engagement groove of the cylinder tube, and its tip fits into the locking hole, thereby fixing the cylinder tube and the cover. In addition, when disassembling this, all you have to do is turn the set screw in the loosening direction, and the locking member will leave the locking hole and completely sink into the hole, so all you need to do is pull out the cover.

When the set screw in the assembled state is loosened to allow the locking member to escape from the engagement hole and fit into the engagement groove, the cover will not come off from the cylinder tube, but will be able to rotate freely. In addition, locking holes into which the locking members are fitted are provided at predetermined intervals on the bottom of the engagement groove, so when changing the position of the port, loosen the set screw slightly and rotate the cover. It is only necessary to tighten the set screw when the locking member comes under the target locking hole, and the port position can be changed without disassembling the cylinder tube and cover one by one.

(c) Effects of the invention According to the invention, the cylinder tube and cover can be disassembled and assembled, and the port position can be changed with the simple operation of screwing a set screw with a tapered tip. Repair work for the cylinder becomes simple, and a cylinder that is not restricted by the installation location can be realized.

Further, since there are no members protruding around the cylinder, the radial dimension is reduced, and the size of the device that uses the cylinder can be reduced.

(d) Practical example of the invention Next, how the fixing structure between the cylinder tube and the cover according to the present invention is actually realized will be explained using an example. Fig. 1 shows an example in which a steel ball is used as a locking member. FIG. Reference numeral 1 designates a cylinder tube, and an annular engagement groove 4 for engaging a locking member 3 is formed on the inner circumferential surface 2 of both ends thereof, and a locking hole 5 smaller than the locking member 3 is formed in the bottom surface of the engagement groove 4. Perforations are also made at predetermined intervals. FIG. 2 is an enlarged cross-sectional view taken along the line - in FIG. 1. Engagement groove 4
The width of the groove is such that the locking member 3 can fit therein. Further, on the outer surface 7 of the insertion portion of the cover 6 into the cylinder tube 1, two sink holes 8 for the locking member 3 are formed at positions corresponding to the engagement grooves 4, for example. The lower part of the side is penetrated with the outside by a screw hole, and in the screw hole,
A set screw 9 having a tapered tip is screwed together so that it can move forward and backward. Here, the sink hole 8 is formed with a size that allows the locking member 3 to fit loosely into it, and a depth that allows the locking member 3 to completely sink into it, and the set screw 9 has its tip connected to the locking member. It is provided so as to be located below the center of 3. The head cover side is also constructed in exactly the same way.

FIG. 3 is a cross-sectional view of a main part showing the method of assembling this fixing structure in the order of steps. First set screw 9
and load the locking member 3 into the hole 8,
Next, the outer surface 7 of the insertion part of the cover 6 is fitted into the cylinder tube 1 until the end of the cylinder tube contacts the stopper 61, so that the engagement groove 4 and the sink hole 8 are aligned. Next, the set screw 9 is screwed in, and the lock member 3 is pushed up by the tapered part of the set screw 9. When the upper part of the lock member 3 enters the engagement groove 4, the cover 6 is rotated to determine the port position. At this time, it goes without saying that the sink hole 8 is aligned with the nearest locking hole 5. Once the port has been positioned, screw in the set screw 9 further.
Tighten to a predetermined torque to secure the locking hole 5.
The head of the locking member 3 is locked. As a result, the cylinder tube 1 and the cover 6 are prevented from rotating and coming off, and are fixed together.

When changing the position of the port, loosen the setscrew 9 from the fixed state until the locking member 3 escapes from the locking hole 5, rotate the cover 6, and move the locking member 3 to the new position. from the nearest locking hole 5, and then tighten the set screw 9.
Tighten.

To disassemble the cylinder tube 1 and cover 6, loosen the set screw 9 until the locking member 3 is completely recessed into the recessed hole 8, and then pull out the cover 6. The head cover side can be assembled and disassembled or the port position can be changed in exactly the same way.

Note that it is also possible to provide only the locking hole 5 without providing the locking groove 4, but when the locking member 3 escapes from the locking hole 5, the cover 6 axially moves away from the cylinder tube 1 as described above. It will not be possible to prevent it from falling out.

In addition, the locking member 3 is not limited to the steel ball shown in the above embodiment, but may also be a roller 31 shown in A of FIG. 4 or a split ring 32 shown in B of FIG. Alternatively, the C-ring 33 shown in C and D may be elastically deformed by expanding the slit using a tapered portion, and a portion of the deformed portion protrudes from the bore hole 8.

The locking hole 5 is not limited to a square hole,
In terms of processing, circular holes as shown in Figure 4 B and D are preferred.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view of a cylinder to which a cylinder tube and a cover are fixed according to the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a diagram showing the order in which the cylinder tube and cover are fixed. , FIG. 4 is a diagram showing another embodiment of the locking member. In the figure, 1 is a cylinder tube, 2 is an inner peripheral surface of the cylinder tube, 3 is a locking member, 4 is an engagement groove, 5 is a locking hole, 6 is a cover, 7 is an insertion part of the cover into the cylinder tube, 8 indicates a sink hole, and 9 indicates a set screw.

Claims (1)

[Scope of utility model registration request] In a cylinder tube in which a part or all of the cover is inserted into the end of the cylinder tube and the cover is fixed to each other, an engagement groove with a locking member is formed in the circumferential direction on the inner surface of the end of the cylinder tube, and the engagement groove is formed in the circumferential direction. A plurality of locking holes smaller than the locking member into which a part of the locking member can be inserted are opened at intervals in the bottom of the groove, and an appropriate number of sink holes are formed at positions corresponding to the locking grooves on the outer surface of the cover. A set screw with a tapered tip is inserted between the side surface of the sink hole and the outside, and the lock member inside the sink hole is inserted into the engagement groove and the lock member in the sink hole by operating the set screw. A fixing structure between a cylinder tube and a cover, characterized in that it can be fitted into a locking hole.